where \(j_0(qr) = \sin (qr)/(qr)\)  is the spherical Bessel function of zero order; \(p(r)\)  corresponds to the distribution of real-space distances between volume elements inside the particle weighted by the excess scattering-length density distribution; see the reviews by Glatter [1]} and by Svergun and Koch [2]} for detailed discussions of the properties of \(p(r)\) . Apart from constant prefactors, the \(p(r)\)  of the azimuthally-averaged single-particle cross section [Eq. (REF )], corresponding to a uniform sphere magnetization, equals (for \(r \le 2R\) ):
\(p(r) = r^2 \left( 1 - \frac{3r}{4R} + \frac{r^3}{16 R^3} \right) .\) 
